Dwayne Leismer
32Patents
16h-index
20Co-inventors
81Inventor score
Filing activity: Sep 9, 1988 → Jan 31, 2023
Most-cited inventions
| Patent | Title | Area | Cited by | Status |
|---|---|---|---|---|
| US6247536A | Downhole multiplexer and related methods | Fixed Constructions | 93 | Expired |
| US6433991B1 | Controlling activation of devices | Mechanical Engineering; Lighting; Heating | 75 | Expired |
| US6296061A | Pilot-operated pressure-equalizing mechanism for subsurface valve | Fixed Constructions | 40 | Expired |
| US5323853A | Emergency downhole disconnect tool | Fixed Constructions | 38 | Expired |
| US5984006A | Emergency release tool | Fixed Constructions | 37 | Expired |
| US5310004A | Fail safe gas bias safety valve | Fixed Constructions | 37 | Expired |
| US5101897A | Slip mechanism for a well tool | Fixed Constructions | 36 | Expired |
| US5167284A | Selective hydraulic lock-out well safety valve and method | Fixed Constructions | 35 | Expired |
| US6308783A | Wellbore flow control device | Emerging Cross-Sectional Technologies | 31 | Expired |
| US4976317A | Well tool hydrostatic release means | Fixed Constructions | 28 | Expired |
| US6491102B2 | Downhole multiplexer and related methods | Fixed Constructions | 28 | Expired |
| US6241015A | Apparatus for remote control of wellbore fluid flow | Emerging Cross-Sectional Technologies | 27 | Expired |
| US4838355A | Dual hydraulic safety valve | Fixed Constructions | 20 | Expired |
| US6237683A | Wellbore flow control device | Emerging Cross-Sectional Technologies | 19 | Expired |
| US6789627B2 | Control line cutting tool and method | Fixed Constructions | 17 | Expired |
| US6712149B2 | Apparatus and method for spacing out of offshore wells | Fixed Constructions | 17 | Expired |
| US6732801B2 | Apparatus and method for completing a junction of plural wellbores | Fixed Constructions | 15 | Expired |
| US9988894B1 | System and method for installing a power line in a well | Mechanical Engineering; Lighting; Heating | 12 | Active |
| US5348090A | Expanded slip well anchor | Fixed Constructions | 11 | Expired |
| US11105160B2 | Low profile, pressure balanced, oil expansion compensated downhole electrical connector system | Fixed Constructions | 6 | Active |
| US6209649A | Selective re-entry tool for multiple tubing completions and method of using | Fixed Constructions | 3 | Expired |
| US7543652B2 | Subsurface annular safety barrier | Fixed Constructions | 3 | Active |
| US11572743B2 | Method and apparatus for testing of the downhole connector electrical system during installation | Electricity | 1 | Active |
| US11821266B2 | Method for testing of the downhole connector electrical system during installation | Electricity | 0 | Active |
| US12276163B2 | Method and apparatus for testing of the downhole connector electrical system during installation | Electricity | 0 | Active |
Source: USPTO / EPO open patent data. Inventor disambiguation is heuristic; counts are objective bibliographic measures.